Microchip Technology Atmel-ICE User Manual page 23

4.2.3 Connecting to a JTAG Target
The Atmel-ICE is equipped with two 50-mil 10-pin JTAG connectors. Both connectors are directly electrically
connected, but conform to two different pinouts; the AVR JTAG header and the Arm Cortex Debug header. The
connector should be selected based on the pinout of the target board, and not the target MCU type - for example, a
SAM device mounted in an AVR STK600 stack should use the AVR header.
The recommended pinout for the 10-pin AVR JTAG connector is shown in
The recommended pinout for the 10-pin Arm Cortex Debug connector is shown in
Direct Connection to a Standard 10-pin 50-mil Header
Use the 50-mil 10-pin flat cable (included in some kits) to connect directly to a board supporting this header type. Use
the AVR connector port on the Atmel-ICE for headers with the AVR pinout, and the SAM connector port for headers
complying with the Arm Cortex Debug header pinout.
The pinouts for both 10-pin connector ports are shown below.
Connection to a Standard 10-pin 100-mil Header
Use a standard 50-mil to 100-mil adapter to connect to 100-mil headers. An adapter board (included in some kits)
can be used for this purpose, or the JTAGICE3 adapter can be used for AVR targets.
Important:
The JTAGICE3 100-mil adapter cannot be used with the SAM connector port since pins 2 and 10 (AVR
GND) on the adapter are connected.
Connection to a Custom 100-mil Header
If your target board does not have a compliant 10-pin JTAG header in 50- or 100-mil, you can map to a custom pinout
using the 10-pin "mini-squid" cable (included in some kits), which gives access to ten individual 100-mil sockets.
Connection to a 20-pin 100-mil Header
Use the adapter board (included in some kits) to connect to targets with a 20-pin 100-mil header.
Table 4-3. Atmel-ICE JTAG Pin Description
Name AVR
PORT
Pin
TCK 1
TMS 5
TDI 9
TDO 3
nTRST 8
nSRST 6
VTG 4
GND 2, 10
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2020 Microchip Technology Inc.
SAM
PORT
Pin
4 Test Clock (clock signal from the Atmel-ICE into the target device)
2 Test Mode Select (control signal from the Atmel-ICE into the target device)
8 Test Data In (data transmitted from the Atmel-ICE into the target device)
6 Test Data Out (data transmitted from the target device into the Atmel-ICE)
- Test Reset (optional, only on some AVR devices). Used to reset the JTAG TAP
controller
10 Reset (optional). Used to reset the target device. Connecting this pin is
recommended since it allows the Atmel-ICE to hold the target device in a Reset
state, which can be essential to debugging in certain scenarios.
1 Target voltage reference. The Atmel-ICE samples the target voltage on this pin to
power the level converters correctly. The Atmel-ICE draws less than 3 mA from this
pin in debugWIRE mode and less than 1 mA in other modes.
3, 5, 9 Ground. All must be connected to ensure that the Atmel-ICE and the target device
share the same ground reference.
Programmers and Debuggers
Figure 4-6.
Figure
Description
User Guide
On-Chip Debugging
4-2.
DS50002999A-page 23